freedom group is owned by the pe firm that said it will put it up for sale after the newtown shootings. >> this gun is obviously knock offable. 15 different companies manufacture this weapon? >> get this. i will take it a step further. there is a lot of accessories. they call it lego for men. like building a jeep. you can throw stuff on there. customize it. hello kitty stocks? for kids? we're going introduce you to a guy, the only part of a gun that has a serial number on it is where the trigger is. that's it. >> this guy is nutritioning the lower receivers out of 3d printers. no serial number. he describes himself as an anarchist. he wants all guns to be untraceable. >> interesting. >> watch him make -- he just got his federal gun making license. the government could not with hold it from him. i watched the documentary the other night. >> a lot of extraordinary reporting that i know you spent a lot of time on. >> america's gun, the rise of the ar-15, premiers tonight here on cnbc. highly recommend it. >> the power house. we will head to the top real estate markets in america. we do th